T.C., you are right. 1/4 cub wheat paste, a pinch of salt (or alum) all combined and stirred, then add to 1 cup of water. Stir while bringing the water to a boil (boil for a minute) and continue stirring as it boils, if it thickens too much, add more water until you have the consistency that you want - on the thick side for tacking leather to leather, thin for cloth to leather. Like the Elmer's glue mentioned above by David, it will let go if you wet it but that is not necessarily a bad thing, it is just there to hold things together while you are cutting and sewing. But be aware that if too much is used to affix cloth to leather, it will bleed through the cloth and be visible even after it dries and lets go, that's why I first recommended the Barge Cement.